Angular filter to limit words count in a string

limit-words.filter.coffee

'use strict'

###*
 # @ngdoc filter
 # @name app.filter:limitWords
 # @description Angular filter to limit words count in a string
 # # limitWords
###
angular.module 'app'
  .filter 'limitWords', ->
    (input, words, end) ->

      # exit if words limit is not number or input is not string
      if isNaN(words) || angular.isUndefined(input)
        return input

      # get words from string
      wordsArray = input.match(/\S+/g)
      wordsCount = wordsArray.length

      # if more than limit
      if wordsCount > words
        input = wordsArray.slice(0, words)
          .join(' ') + (end || '...')

      # return filtered input
      input